Free SF apartment background check

320-328 Walnut St

Presidio Heights, SF 94118 1008015 3 units · 3 fl · 1904

This building has a higher-than-average number of open problems nearby. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Presidio Heights
At or below average
avg 1.2
0
FewerMore

This building has 0 novs (7y), at or below the Presidio Heights average of 1.2.

Rent & eviction protection

Is 320-328 Walnut St rent-controlled?

San Francisco's Rent Ordinance caps rent increases and provides eviction protection for most residential units built before 1979 with 2+ units. Here's how this building scores.

Built before 1979
Built 1904
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
RH2
Likely rent-controlled. Building age and unit count suggest this property falls under San Francisco's Rent Ordinance.

Based on SF Assessor records. Not legal advice — confirm with the SF Rent Board.

Building characteristics
Units3
Floors3
Year built1904
Total area3,100 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1008015
Ownership

Registered owner per SF Assessor-Recorder (secured roll).

Owner name
Koon Fmly Tr
Mailing address
Koon Jason Mington & Lin Hs 320 Walnut St San Francisco CA 94118
Last sale
032317

Landlord portfolio

Other SF properties this owner holds, with risk grades for each.

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Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

324 Walnut St, San Francisco, CA 94118
328 Walnut St, San Francisco, CA 94118
320 Walnut St, San Francisco, CA 94118
Augrented Insights
Initial analysis

The three-unit multi-family residential building at 320-328 Walnut Street in Presidio Heights, owned by Koon Fmly Tr, has undergone significant renovations and improvements over the past several years. Built in 1904, the three-story apartment building has seen substantial updates between 2018-2022, including a major facade renovation in 2018 ($40,000) that involved removing non-historic elements, installing new wood double-hung windows, and replacing various structural elements. The building received a new roof in 2019 ($23,700), and more recent work has included electrical upgrades (new subpanel in 2022 and rewiring two units in 2021) and plumbing improvements, such as shower pan installations (2019) and a sewer/housetrap replacement (2021). Earlier violations from 2007 related to fire safety and rear stair maintenance were all abated by January 2008, and while there were some complaints about construction debris and window installations in 2018-2019, these issues were resolved.

The property has maintained active upkeep through various permits and improvements, with recent work suggesting ongoing maintenance of building systems and compliance with current standards. The most recent significant building work includes electrical and plumbing upgrades, while the building's exterior has received attention through various renovations and repairs. The property has experienced several parking-related issues based on recent 311 calls (2024), but these are external to the building itself. A notable withdrawn planning proposal was for alterations and a rear addition to modify unit configurations and improve amenities, though this was not pursued. The only recorded fire incident was a minor water or steam leak with no injuries reported.

AI-generated · may contain errors · check the source data tables below

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Risk rating

How 320-328 Walnut St's risk score is calculated

We trained a model on 7 years of SF DBI inspection data — notice of violation filings, complaint history, and owner track records. It estimates the probability that DBI inspectors will issue a Notice of Violation at this address in the next 12 months. Lower % = safer.

What the score means for you

Grade A–B — Low risk

DBI rarely finds violations here. Strong maintenance history and a clean complaint record.

Grade C — Moderate risk

Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.

Grade D–F — High risk

Elevated violation and complaint history. DBI has found issues here before and is statistically likely to again.

Neighborhood percentile
43th percentile

Out of 181 buildings in this neighborhood, 103 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
70%
No DBI
violation
30%
DBI violation
likely
Model explanation

What's driving this score

The three data points that most influenced this building's risk rating — ranked by the weight the model placed on each one.

Estimated permit spend (past 7 years)

Dollar value of permits pulled at this address — large recent spend can signal deferred-maintenance catch-up.

Building age

Older buildings tend to have more maintenance challenges; SF's pre-1906 earthquake housing stock carries distinct risk.

Owner's portfolio size

Number of SF parcels this owner is registered on — larger portfolios have distinct risk patterns.

12-Month severity forecast
No violation 74.8%
Moderate concern 19.8%
Severe concern 5.4%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

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The story over time

320-328 Walnut St event timeline

Violations, complaints, fire incidents, permits, and buyouts — most recent records in order.

2026
Electrical Permit Apr 17
Ref ew201806123644 for final inspection only
Complete
Electrical PermitApr 17
Ref ew202206124050 for final inspection

See all 18 events

Full history back to 2019 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 320-328 Walnut St apartments

13 SF public datasets for this parcel — permits, violations, complaints, fire records, 311 calls, planning records, and buyouts.

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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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